Grout brush



FIG. 1 is a front right side perspective view of a grout brush which embodies our design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view, the right side view being a mirror image there

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The material in dotted lines forms no part of our design. 

The ornamental design for a grout brush, as shown and described. 